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Steel slag recycling method

A technology of iron and steel slag and tailing slag, which is applied in the field of recycling and utilization of iron and steel slag, which can solve the problems of polluting the surrounding environment, occupying farmland land, and increasing the pH value, and achieves the effects of reducing smelting costs, reducing greenhouse gas emissions, and reducing steel scrap consumption

Active Publication Date: 2015-07-22
MCC BAOSTEEL TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, many steel slags need to be piled up in large quantities because they have not been effectively processed and utilized, which not only directly occupies a large amount of farmland, but also has a large amount of dust and rainwater washing away, causing calcium oxide to dissolve in water, causing the nearby soil to become alkaline, and the pH value of nearby waters or rivers It has seriously polluted the surrounding environment and constituted a difficult point in the environmental management of iron and steel enterprises.

Method used

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Effect test

Embodiment 1

[0067] Embodiment 1 pretreatment

[0068] A steel plant has 100 tons of steel slag and iron slag at 40°C with a moisture content of 10wt%. There are 4 pieces of slag with a maximum diameter of 300mm on the surface, and the surface area of ​​slag is 8-12mm. After fully mixing 50 tons of 300°C high-temperature slag and pretreatment for 8 hours, it was found that the steel slag on the surface of the slag iron and steel was completely peeled off, and the effective separation of slag and iron was realized. At the same time, it was also found that the large pieces of steel slag were naturally pulverized and completely turned into small pieces And granular, the water content after mixing pretreatment is 4wt%, the calcium oxide content is 40wt%, and the total iron content is 32wt%.

Embodiment 2

[0069] Embodiment 2 pretreatment

[0070] A steel plant has 250 tons of steel slag and iron slag at 35°C with a moisture content of 10wt%. There are 5 pieces of slag with a maximum diameter of 280mm on the surface. After fully mixing 100 tons of high-temperature slag at 230°C and pretreatment for 10 hours, it was found that the steel slag on the surface of the slag iron and steel was completely peeled off, realizing the effective separation of slag and iron. At the same time, it was also found that the large pieces of steel slag were naturally pulverized and completely turned into small pieces And granular, the water content after mixing pretreatment is 3wt%, the calcium oxide content is 50wt%, and the total iron content is 30wt%.

Embodiment 3

[0071] Embodiment 3 pretreatment

[0072] 150 tons of 30°C steel slag and iron slag from a steel plant, with a moisture content of 10wt%, were fully mixed with 50 tons of 100°C high-temperature slag and pretreated for 12 hours. It was found that the steel slag on the surface of the slag steel was completely peeled off, and the slag and iron were effectively separated. At the same time, it is also found that the large pieces of steel slag are naturally pulverized and completely become small pieces and granules. After mixing and pretreatment, the moisture content is 5wt%, the calcium oxide content is 62wt%, and the total iron content is 31wt%.

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Abstract

The invention relates to a steel slag recycling method. The method comprises the following steps: carrying out mixing pretreatment on 100DEG C or above steel slag and 30-40DEG C steel slag, and carrying out multi-time magnetic separation, multi-time screening and multi-time fragmentation for recovery in order to obtain a low-iron metallurgy production auxiliary material substitute; and carrying out magnetic separation on a magnetic separation material in the steel slag, grinding, screening, and carrying out dry wind magnetic separation for recovery in order to obtain a high-iron metallurgy production auxiliary material substitute. The method reduces the smelting cost of a steel plant, reduces the exploitation and calcination of natural ore, reduces the discharge of greenhouse gas, has very good environmental protection benefit, and realizes short flow and high recovery utilization of the steel slag.

Description

technical field [0001] The invention relates to a method for recycling waste slag in the metallurgical industry, in particular to a method for recycling iron and steel slag. Background technique [0002] Metallurgical steel plants discharge about 100 million tons of iron and steel slag every year. When the iron and steel slag is discharged, it is liquid and molten. It not only contains a lot of heat, but also has about 10% impurity residual steel (so-called "impurity" - slag Iron-coated, iron-coated slag forms), and a large number of oxide complexes and beneficial elements and many other useful ingredients. Moreover, many steel slags need to be piled up in large quantities because they have not been effectively processed and utilized, which not only directly occupies a large amount of farmland, but also has a large amount of dust and rainwater washing away, causing calcium oxide to dissolve in water, causing the nearby soil to become alkaline, and the pH value of nearby wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04
CPCC21B3/04Y02P10/20Y02W30/50
Inventor 陈伟胡治春吴守仓
Owner MCC BAOSTEEL TECH SERVICE
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